Citation: CHEN Dong-Po, ZHANG Xiao-Dan, WEI Chang-Chun, LIU Cai-Chi, ZHAO Ying. Effect of Blocking Layers Prepared by the Hydrolysis of TiCl₄ Solution on the Photovoltaic Performance of a Dye-Sensitized Solar Cell[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 425-431. doi: 10.3866/PKU.WHXB20110222 shu

Effect of Blocking Layers Prepared by the Hydrolysis of TiCl₄ Solution on the Photovoltaic Performance of a Dye-Sensitized Solar Cell

1.
1. Institute of Photo-Electronic Thin Film Devices and Technology of Nankai University, Tianjin Key Laboratory of Photo-Electronic Thin Film Devices and Technology, Key Laboratory of Opto-Electronic Information Science and Technology of Ministry of Education, Tianjin 300071, P. R. China;
2. Institute of Information and Function Materials, Hebei University of Technology, Tianjin 300130, P. R. China

Received Date: 20 September 2010
Available Online: 4 January 2011
Fund Project: 国家高技术研究发展规划(863) (2007AA05Z436, 2009AA050602) (863) (2007AA05Z436, 2009AA050602) 国家重点基础研究发展规划(973) (2006CB202602, 2006CB202603) (973) (2006CB202602, 2006CB202603) 国家自然科学基金(60976051) (60976051)教育部新世纪人才计划(NCET-08-0295)资助项目 (NCET-08-0295)

Blocking layer thin films were prepared on a conductive fluorine-doped tin oxide (FTO) substrate by the hydrolysis of TiCl₄ solution with different concentrations. This blocked the recombination between photoelectrons and I₃^-. Blocking layer compositions were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The surface morphology and transmittance were determined by field emission scanning electron microscopy (FE-SEM) and UV-visible spectrophotometry. The photovoltaic performance of the dye-sensitized solar cells (DSSC) was measured under AM1.5 illumination and under dark conditions. We found that the blocking layers were composed of TiO₂ particles. Increasing the concentration of TiCl₄ in solution leads to an increase in the blocking layer thickness. Apart from the increase in thickness, the morphology develops as the concentration increases. The transmittance of FTO decreases after the blocking layers deposit on the surface and the blocking layers prepared using 0.04 mol·L^-1 TiCl₄ solution can suppress the dark current most efficiently and we thus obtained the highest power conversion efficiency of 7.84% under AM1.5 illumination conditions.
- Dye-sensitized solar cell,
- Blocking layer,
- TiO₂ thin film,
- Dark current,
- TiCl₄
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Effect of Blocking Layers Prepared by the Hydrolysis of TiCl₄ Solution on the Photovoltaic Performance of a Dye-Sensitized Solar Cell